They're probably trying to be careful not to stray too far away from a yellow deco, so it's not a huge change. My 3yo can identify Bumblebee instantly... not sure she could in a different overall color scheme. A Prime one would be neat, but they're likely trying to avoid potential confusion with ROC Prime.

These things do have a target audience, so I'm not sure we need to hate on them when they're simply priming the next generation.